TY  - BOOK
AU  - Watts,Simon
AU  - Halliwell,Lyndsay
TI  - Essential environmental science: methods and techniques 
SN  - 0415132479
AV  - GE70 .E87 1996
PY  - 1996///
CY  - London
PB  - Routledge
KW  - Environmental science
ER  -